There are many websites, allowing you to share your files with friends as more secure, convenient, and allowing bigger sizes alternative for the email attachments. However, Up1 is probably the simplest, the fastest, and the easiest to use.
Indeed, it is the simplest file hosting application you will find on the internet. Just drag-in the file you want to share and the application will handle it. You can share any file you want with your friends in a more secured way as the file is encrypted on the client side. The free service also integrates a "Paste" editor, a PDF viewer, and mp3/video player.
No registration or authorization is required to use the service.